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Pretty confident you had a misfire there. I dont think boost leaks are your problem here, something is up with your fueling or ignition perhaps.
You should get your codes read by a BMW diagnostic tool or a tool that reads shadow codes like bavarian technic tool.
If I recall your previous thread correctly I think you said you changed your spark plugs. If so you might want to pull them out and make sure they are gapped correctly. A large gap would cause misfires, but they should be gapped correctly out of the box, I always double check nowadays.
Do you recall if they were oily? (Could mean a valve gasket is leaking) or black with fuel? (Could mean a bad injector or ring)
Have your injectors been replaced? Under recall?
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